400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Encyclopaedia Americana. Popular Dictionary Arts, Sciences, Literature, History, Politics Biography. New Ed.; Including Copious Collection Original Articles American Biography; Basis 7th Ed German Conversations-lexicon because the request was invalid.

This might be because the link was created a long time ago. Try your search again on Google. That’s all we know.